diff --git a/index.js b/index.js
index 34eb845..5d16af4 100644
--- a/index.js
+++ b/index.js
@@ -43,6 +43,14 @@ function fastifyResponseValidation (fastify, opts, next) {
   function onRoute (routeOpts) {
     if (routeOpts.responseValidation === false) return
     if (routeOpts.schema && routeOpts.schema.response) {
+      const schemas = Object.values(fastify.getSchemas())
+
+      for (const schema of schemas) {
+        if (!ajv.getSchema(schema.$id)) {
+          ajv.addSchema(schema)
+        }
+      }
+
       const responseStatusCodeValidation = routeOpts.responseStatusCodeValidation || opts.responseStatusCodeValidation || false
       routeOpts.preSerialization = routeOpts.preSerialization || []
       routeOpts.preSerialization.push(buildHook(routeOpts.schema.response, responseStatusCodeValidation))
diff --git a/test/index.test.js b/test/index.test.js
index a572994..e533ee8 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -194,6 +194,42 @@ test('Should support media types', async t => {
   t.assert.deepStrictEqual(JSON.parse(response.payload), { answer: 42 })
 })
 
+test('Should support ref schema', async (t) => {
+  const fastify = Fastify()
+  await fastify.register(plugin)
+
+  fastify.addSchema({
+    $id: 'answerSchema',
+    type: 'object',
+    properties: {
+      answer: { type: 'number' }
+    }
+  })
+
+  fastify.route({
+    method: 'GET',
+    url: '/',
+    schema: {
+      response: {
+        '2xx': {
+          $ref: 'answerSchema'
+        }
+      }
+    },
+    handler: async (req, reply) => {
+      return { answer: 42 }
+    }
+  })
+
+  const response = await fastify.inject({
+    method: 'GET',
+    url: '/'
+  })
+
+  t.assert.strictEqual(response.statusCode, 200)
+  t.assert.deepStrictEqual(JSON.parse(response.payload), { answer: 42 })
+})
+
 test('Should check anyOf Schema', async t => {
   const fastify = Fastify()
   await fastify.register(plugin)